Improvement in door-knob fastenings



NrrED STATES Enron.'

JEROME B WELLS, OF ROCHESTER, NEW YORK.

IMPROVEMENT IN DOOR-KNOB FASTENINGS.

Specieation forming part of Letters Patent No. 159,486, dated February2, 1875; application led r November 28, 1874.

To all whom it may concern:

Beit known that I, JEROME B. WELLs, of the city of Rochester, in thecounty of Monroe and State of New York, have invented a certain new anduseful Improvement in Door- Knob Fastenings; and I do hereby declarethat the following is a full, clear, and exact description of theconstruction and operation of the same, reference being had to theaccompanying drawings, in which- Figure l is a central vertical sectionof a door-knob, showing my improvement applied to a door. Fig. 2 is aperspective view of the lock and fastening detached. Fig. 3 is acrosssection ofthe knob-shank and spindle.

My'improvement relates to fastenings for door-knobs, to prevent thewithdrawal of the lock-bolt from its keeper by the turning ofthe knob,thereby avoiding the necessity of a separate lock and key, 0r an outsidebolt. rIhe invention consists in the combination, with the knob-shank,lock-case, and cam, of a sliding bolt, which tits in a longitudinalgroove cut in the shank, and is provided with a flat bit, which strikesinto a notch or sloteut halt' vin the lock-case and half in theoperatingcam, for preventing the turning of the cam, all as hereinafterdescribed.

In the drawings, A represents a door. B B are the knobs. C C are theknob-Shanks. Dis the spindle. E is the lock-case. F is the cam, and G isthe catch or bolt of an ordinary door-knob. One of the knobshanks C isprovided -with a longitudinal slot or groove, ct, cut in its periphery,in Which fits a bolt, H, so as to slide forward or back. I prefer tomake the slot and bolt dovetailed in cross-section, as shown in Fig. 3,so that the bolt will it closely, and will not fall out, while it has afree movement; and so, also, that, on the outside, the bolt will t iiushwith the surface of the shank, and present as narrow a joint aspossible. 'The outer end of the bolt has a thumb-piece, b, turned up atright angles, so as to be easily seized by the fingers. The inner end isprovided with a flat bit, c, and also with a projecting point, d. Thelockcase E and cam F have a narrow slot, f, formed half in each. Thisslot is coincident with the bolt H, and of such size as to admit theeasy entrance of the bit c. When the bolt H is pushed inward the bit cstrikes into the slot f, and, holding half in the lock-case and halt inthe cam, prevents the cam from being turned, and locks the door-knobfast. The lock-bolt G, therefore, cannot be drawn backward from itskeeper by the door-knob. The point d of the bolt always rests in theslot f, and forms a bearing-guide to the bolt in entering the slot. Itis made narrow, so that when the bolt is drawn back it will not projectinto the notch of the lock-case, and interfere with the turning of thecam.

This arrangement dispenses with the necessity of a separate key-lock onmany doors, and also with the use of outside bolts. It is in aconvenient and compact form, being combined directly with the door-knob,and the cost is but a trifle over an ordinary door-knob.

It presents the same appearance as an ordinary door-knob, and the boltis so connected that in seizing the knob to turn it the bolt can also beoperated, thereby saving one movement.

A special yadvantage is the direct connection ot' the slide with theknob, by which it is operated with it, and presents no unsightlyappearance. In this respect it is superior to other fastenings,Which arecomplicated and i expensive in construction.

The slot or notch f can be cast in the lockcase and cam, thereby addingnothing to the expense. The slot a in the shank can also be cast, andrequires but slight dressing to make it smooth.

The bolt H can be made of malleable iron,

witnesses.

JEROME B. WELLS. Witnesses:

B. F. Oseoon, EDWIN B. SCOTT.

